should i phone or wait for her to phone me?

Visitor's Question from a 16-20 year old Malewell, i am supposed to go out wit this girl i really like from my school this weekend, i was talking with her in school last week and she told me she wanted to do something this weekend and i told her to call me whenever she wanted to do something she said ok but i tried calling her yesterday and she never picked up i just want to find out if she still wants to go, or whatever and i dont know if i should wait for her to call or if i should call her